I wonder how much of the extra 45 ponies that is due to Valvetronic and how linear this addition will be when increasing the boost. I.e will a Dinan N63TU possibly have the same hp as an M5? If this is the case I would think the question of the 2013 engine is very important to the F10 crowd that aim to tune their cars. Personally I wouldn't care if it's 400hp or 800hp. 4000 lbs or 3000 lbs on the other hand...